Traits taxon details
original description
(of Unio percorrugata Whitfield, 1903 †) Whitfield, R.P. (1903). Notice of six new species of Unios from the Laramie Group. <em>Bulletin of the American Museum of Natural History.</em> 19(15): 483-487., available online at http://digitallibrary.amnh.org/bitstream/handle/2246/659//v2/dspace/ingest/pdfSource/bul/B019a15.pdf?sequence=1&isAllowed=y page(s): 486-487, pl. 40, figs 3-9 [details] 
basis of record
Henderson, J. (1935). Fossil non-marine Mollusca of North America. <em>Geological Society of America Special Papers.</em> 3: 1-313. page(s): 70 [details] Available for editors 
basis of record
Russell, L.S. (1976). Pelecypods of the Hell Creek Formation (Uppermost Cretaceous) of Garfield County, Montana. <em>Canadian Journal of Earth Sciences.</em> 13: 365-388. [details] Available for editors 
additional source
Scholz, H.; Hartman, J. H. (2007). Paleoenvironmental reconstruction of the Upper Cretaceous Hell Creek Formation of the Williston Basin, Montana, USA: Implications from the quantitative analysis of unionoid bivalve taxonomic diversity and morphologic disparity. <em>Palaios.</em> 22(1): 24-34., available online at https://doi.org/10.2110/palo.2005.p05-059r [details] Available for editors 
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